External & Internal Signs

Classical Furunculosis derives its name from the boil-like lesions observed by Emmerich and Weibel (1894) on the skin and in the musculature of infected fish. However, development of 'furuncles' on the dorsal body are the exception rather than the rule (Bernoth, 1997b) and, in the experience of this author, only occur in older fish suffering from the chronic form of the disease.

Clinical infection by typical Aeromonas salmonicida.

Salmonid fish species from which typical Aeromonas salmonicida has been isolated.

Scientific NameCommon Name
Salmo salarAtlantic salmon
Oncorhynchus rhodurusAmago salmon
Salvelinus fontinalisBrook trout
Salmo trutta m. lacustrisBrown trout
Oncorhynchus tshawytschaChinook salmon
Oncorhynchus ketaChum salmon
Oncorhynchus kisutchCoho salmon
Salmo clarkiCutthroat trout
Salvelinus malmaDolly Varden
Salvelinus leucomaenisJapanese char
Salvelinus namaycushLake trout
Oncorhynchus masouMasu salmon
Oncorhynchus gorbuschaPink salmon
Coregonus pollanPollan
Oncorhynchus mykissRainbow trout
Salmo trutta m. truttaSea trout
Oncorhynchus nerkaSockeye salmon

Additional fish species from which typical Aeromonas salmonicida has been isolated.

Scientific NameCommon Name
Gadus morhuaAtlantic cod
Sparus aurataSea bream
Psetta maxima /Scophthalmus maximusTurbot
Anguilla rostrataAmerican eel
Hybognathus hankinsoniBrassy minnow
Culaea inconstansBrook stickleback
Cyprinus carpioCarp
Silurus glanisCatfish
Ichthyomyzon castaneumChestnut lamprey
Notropis cornutusCommon shiner
Semotilus atromaculatusCreek chub
Anguilla anguillaEuropean eel
Pimephales promelasFathead minnow
Cottus gobioGoby
Notemigonus crysoleucasGolden shiner
Roccus mississippiensisGroper
Not specifiedLamprey
Phoxinus phoxinusMinnow
Cottus bairdiMottled sculpin
Esox luciusNorthern pike
Polyodon spathulaPaddlefish
Chromomus eosRedbelly dace
Micropterus dolomieuiSmallmouth bass
Gasterosteus aculeatusStickleback

Disease reprinted courtesy of OIE Diagnostic Manual for Aquatic Animal Diseases, OIE (World Organisation for Animal Health), Paris, France.